plastic tub size?

hey everyone!

I bought a plastic tub today which is 29" long x 20" wide x 5" high as my ball python Julius needs an upgrade and i decided to buy it cause plastic tubs of this size seem to be very hard to find in Ireland.

Julius is around 1 1/2 years old is this too big for him? and when i move him in will this be big enough for him for the rest of his life?

thanks for the help!

Here are some of the sizes I use

Baby – 12 Quarts (16 3/8"L x 11 1/2"W x 5 7/8"H)
Sub-Adult - 32 Quarts (23 1/2"L x 16 1/4"W x 6 3/8"H)
Adult - 41 Quarts (34 3/4"L x 16 1/2"W x 6"H)

Yeahup.. I use a 41 quart for my adult.